Inventory wise, I think adding a new low tech backpack would be nice, larger inventory than the basic jetpack/spacepack but lack of jetpack ability, would be nice to use indoors or around your base where you don't use the jetpack as much.
Also make the Hardsuit Backpack have a larger inventory than the Hardsuit Jetpack since you give up the jetpack ability for more inventory
Having toolboxes could also be nice, would look better on the inventory and could be used for all your spray painters without fitting an entire backpack inside your own or multiple tool belts, and would be easier to distinguish by coloring. Also, very fitting for a ss13 inspired game.